Table 2.

Condensation/cycloisomerization of alkyne 3.^a

Entry	[Ag] catalyst	Loading (mol %)	Yieldb (%)
1	–	–	35
2	AgOTf	2.5	73
3	1a	1	76
4	1b	1	67
5	1c	1	72
6	1d	1	76
7	1a	0.5	73
8	1b	0.5	73
9	1c	0.5	67
10	1d	0.5	64

^aUnless specified, all the reactions were performed at 50 °C under argon atmosphere in dry 1,2-dichloroethane for 12–16 h, in the presence of alkyne 3 (27 mg, 0.2 mmol), benzylamine (0.3 mmol) and a silver(I) catalyst (0.5–2.5 mol %). ^bIsolated yield.